TMD flags heavy rain in 8 southern provinces on November 10

The Thai Meteorological Department (TMD) forecast isolated heavy rain in eight southern provinces on November 10, 2026, warning of possible flash floods and mountain runoff as cooler weather and strong winds spread across upper Thailand.

The TMD outlook covers 6am on November 10 to 6am on November 11, Thai time. Most of upper Thailand will have little rain, although thundershowers and gusty winds are expected in parts of the upper North.

TMD urged southern residents to watch for hazards from thundershowers, heavy rain and accumulated rainfall, particularly on foothill slopes near waterways and in low-lying areas, where flash floods and mountain runoff could occur.

TMD attributed the changing conditions to another relatively strong high-pressure system, or cold air mass, from China extending over upper Thailand and the South China Sea. A westerly trough is moving across Myanmar and northern Thailand, while a moderate northeast monsoon covers the Gulf of Thailand, the South and the Andaman Sea.

Heavy rain expected in eight southern provinces

TMD expects thundershowers across 70% of the South’s east-coast region in its November 10–11 forecast, with isolated heavy rain in Chumphon, Surat Thani, Nakhon Si Thammarat, Phatthalung, Songkhla, Pattani, Yala and Narathiwat. Minimum temperatures will be 23–24°C and maximums 28–32°C.

On the South’s west coast, TMD forecasts thundershowers over 40% of the region on November 10–11, mainly in Ranong, Phang Nga, Trang and Satun. Minimum temperatures will range from 23–25°C, with maximums of 30–33°C.

Bangkok and upper Thailand face cooler mornings and strong winds

Bangkok and surrounding provinces are expected to have cool mornings, strong winds and a 1–2°C temperature drop, with isolated light rain, according to TMD’s November 10–11 forecast. Minimum temperatures will be 22–23°C and maximums 32–34°C, with northeasterly winds of 10–30km/h.

In the North, TMD forecasts cool mornings, strong winds and a slight temperature drop on November 10–11, with thundershowers covering 20% of the region and localised gusty winds, mainly in Mae Hong Son, Chiang Mai and Chiang Rai. Minimum temperatures will be 19–23°C and maximums 28–32°C, while mountaintops will be cold, with minimums of 9–15°C. Easterly winds will blow at 10–30km/h.

The Northeast will have cool mornings and strong winds, with temperatures falling by 1–2°C on November 10–11, TMD forecasts. Minimums will be 18–21°C and maximums 30–32°C, while mountaintops will be cold, with minimums of 10–14°C. Northeasterly winds will reach 15–30km/h.

For the Central region, TMD’s November 10–11 outlook indicates cool mornings, strong winds, a slight temperature decline and isolated light rain. Minimum temperatures will be 22–24°C and maximums 31–33°C, with northeasterly winds of 10–30km/h.

The East is forecast to have cool mornings, strong winds and a 1–2°C temperature drop on November 10–11, with isolated light rain, according to TMD. Minimum temperatures will be 21–23°C and maximums 31–34°C, with northeasterly winds of 15–30km/h. Waves will be about 1 metre high, exceeding 1 metre offshore.

TMD advised people across upper Thailand to take care of their health as temperatures fall, while farmers should prepare to protect agricultural produce from strong winds.

Gulf and Andaman waves exceed 2 metres in thundershowers

Winds and waves in the Gulf of Thailand and the Andaman Sea are strengthening, with waves expected to exceed 2 metres in thundershowers, according to TMD’s November 10–11 outlook. Waves in the lower Gulf will be about 2 metres high outside thundershowers.

Along the Gulf coast from Chumphon northwards, TMD forecasts easterly winds of 15–35km/h and waves of 1–2 metres on November 10–11, rising above 2 metres in thundershowers. From Surat Thani southwards, southeasterly winds will reach 20–35km/h, with waves of about 2 metres and more than 2 metres in thundershowers.

Along the South’s Andaman coast, TMD’s November 10–11 forecast gives easterly winds of 15–35km/h, with waves of about 1 metre near the coast, around 2 metres offshore and more than 2 metres in thundershowers. TMD advised mariners to navigate cautiously and avoid sailing through thundershowers.